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    <title>链接标签</title><h1>a是链接标签</h1>
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    <h2>链接标签</h2>
    <a href="http://www.baidu.com">百度</a>
<h2>_self是当前网页打开</h2>
    <a href="http://www.qq.com" target="_self">腾讯网</a>
    <h2>blank是新建窗口打开</h2>
    <a href="http://www.qq.com" target="_blank">腾讯网</a>
    <h2>下载链接</h2>
    <a href="img.zip">下载链接</a>
    <h2>图片链接</h2>
    <a href="http://www.qq.com" target="_self"><img src="img.jpg" width="500"/></a>
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